[GHC] #11678: runhaskell (and ghc, ghci) fail to run if HOME is not set

[GHC]

#11678: runhaskell (and ghc, ghci) fail to run if HOME is not set
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        Reporter:  crosser           |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1971
       Wiki Page:                    |
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Comment (by rwbarton):

 ghc(i) already worked fine with `HOME=/` or some other nonsense value
 causing there to be no existent user package database.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11678#comment:2>
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